1. Astronomy Centre, Department of Physics and Astronomy, University of Sussex, Brighton BN1 9QH, UK
2. CEA Saclay, DSM/Irfu/Service d'Astrophysique, Orme des Merisiers, F-91191 Gif-sur-Yvette Cedex, France
3. Dark Cosmology Centre, Niels Bohr Institute, University of Copenhagen, Juliane Mariesvej 30, DK-2100 Copenhagen, Denmark
4. Institute for Astronomy, Astrophysics, Space Applications and Remote Sensing, National Observatory of Athens, GR-15236 Athens, Greece
5. Faculty of Physics, Ludwig-Maximilians University, Scheinerstr. 1, D-81679 Munich, Germany
6. Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, Kashiwa, Chiba 277-8583, Japan
7. Department of Physics, Faculty of Science, Chulalongkorn University, 254 Phayathai Road, Pathumwan, Bangkok 10330, Thailand
8. European Southern Observatory, Karl Schwarzschild Straße 2, D-85748 Garching, Germany
9. Geneva Observatory, Université de Genève, Chemin des Maillettes 51, CH-1290 Versoix, Switzerland
10. National Radio Astronomy Observatory, 1003 Lopezville Road, Socorro, NM 87801, USA
11. National Radio Astronomy Observatory, Charlottesville, VA 22903, USA